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The generator of AM EMFs consists of a battery-driven radiofrequency (RF) EMF generator connected to a 1.5 m long 50 ? coaxial cable, to the other end of which a stainless-steel spoon-shaped mouthpiece is connected via an impedance transformer. The RF source of the device corresponds to a class C amplifier operating at 27.12 MHz. The carrier frequency is AM with a modulation depth of 85±5%, whereas the modulation frequency is generated by a digital direct synthesiser with a resolution of 10-7. The treatment sequence is controlled by a microcontroller (Atmel AT89S8252, Fribourg, Switzerland), that is, duration of session, sequence of modulation frequencies and duration of each sequence can be programmed via PC over a RS232 interface. The RF output is adjusted to 100 mW into a 50 ? load, which results in an emitting power identical to that of the device used for the treatment of insomnia.
We have seen that a practical power source may be modelled by an ideal constant voltage source in series with a resistor - a Thevenin equivalent circuit Alternati
Q. What do you mean by Feedback in amplification? Feedback : Feedback in its broadest sense means that a certain amount of the output signal is "fed back" into the input. An
Note transducers convert a physical quantity from one form to another. The case below illustrates a typical moving coil meter that converts a current into a mechanical a
A 3 phase 60 hertz induction motor has 8 poles and operates with a slip of .05 for a certain load. Compute in r.p.m. the (a) Speed of the rotor with respect to the stator, (b
To find out the largest of ten 8 bit numbers. Method: The numbers are stored in consecutive memory locations. The counter register is initialized with 0A and the address pointer po
A method used in advanced microprocessors where the microprocessor begins implementing a second instruction before the first has been done. That is, various instructions are in the
Design two converters - boost-buck (Cuk) and flyback meeting the following criteria: Vin = 15 V ... 35 V Vout = 25 V Output voltage ripple 1% peak to peak Switching frequen
Write discussion on Construction and working of analog type storage oscilloscope
Q. For the circuit shown in Figure, develop and execute a PSpice program to obtain the node voltages and the current through each element.
Why do wenot see the battery and capacitor combination for power backup? Ans) There are "super capacitors" that are used for power backup - they are well-organized for short-te
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